REPLIGEN CORP — Director's Dealing 2022

Mar 1, 2022

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: REPLIGEN CORP (RGEN)
CIK: 0000730272
Period of Report: 2022-02-24

Reporting Person: Bylund James (Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2022-02-24	Common Stock	A	3366	$0.00	Acquired	10256	Direct
2022-02-24	Common Stock	F	188	$189.21	Disposed	10068	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2022-02-24	Stock Option (Right to Buy)	$189.21	A	4312	Acquired	2032-02-24	Common Stock (4312)	Direct

Footnotes

F1: Mr. Bylund was awarded 3,366 restricted stock units. Each restricted stock unit represents a contingent right to receive one share of Repligen Corporation's Common Stock. The restricted stock units vest in equal annual instalments over a three-year period beginning on the first anniversary of the grant date. The restricted stock units may be settled only by delivering shares of Repligen Corporation's Common Stock, and thus, the grant is being reported in Table 1 as allowed per SEC guidance.

F2: Represents the number of shares withheld by the Issuer to satisfy tax withholding obligations of the reporting person that arose upon the release of restricted stock units.

F3: One third of the stock options will vest and become exercisable annually on February 24, 2023, February 24, 2024 and February 24, 2025.